161550723 has 8 divisors (see below), whose sum is σ = 216041488. Its totient is φ = 107380224.

The previous prime is 161550721. The next prime is 161550733. The reversal of 161550723 is 327055161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161550723 - 2¹ = 161550721 is a prime.

It is a super-2 number, since 2×161550723² = 52197272203645458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161550721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78886 + ... + 80907.

It is an arithmetic number, because the mean of its divisors is an integer number (27005186).

Almost surely, 2^161550723 is an apocalyptic number.

161550723 is a deficient number, since it is larger than the sum of its proper divisors (54490765).

161550723 is a wasteful number, since it uses less digits than its factorization.

161550723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160133.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 161550723 is about 12710.2605402092. The cubic root of 161550723 is about 544.6317665187.

The spelling of 161550723 in words is "one hundred sixty-one million, five hundred fifty thousand, seven hundred twenty-three".